frequency=13
period_name=( January February March April May June July August Summer September October November December )

first=130
last=227
period=10
year=2006

number=$first
while [ $number -le $last ]
do
    echo "${number},${period_name[${period}]},${year}"
    let number=number+1
    let period=(period+1)%frequency
    if [ $period -eq 0 ]
    then
        let year=year+1
    fi
done

